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| Le Moigne, Frederic A. C.; Moore, C. Mark; Sanders, Richard J.; Villa-alfageme, Maria; Steigenberger, Sebastian; Achterberg, Eric P.. |
| Estimates of the amount of carbon sequestered in the ocean interior per unit iron (Fe) supplied, as quantified by the sequestration efficiency (C-effx), vary widely. Such variability in C-effx has frequently been attributed to estimate uncertainty rather than intrinsic variability. Here we derive new estimates of C-effx for the subpolar North Atlantic, where Fe stressed conditions have recently been demonstrated. Derived values of C-effx from across the region, including areas subject to atypical external Fe fertilization events during the year of sample collection (2010), ranged from 17 to 19 kmol C (mol Fe-1). Comparing these estimates with values from other systems, considered in the context of variable bloom durations in the different oceanographic... |
| Tipo: Text |
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| Ano: 2014 |
URL: https://archimer.ifremer.fr/doc/00290/40112/39249.pdf |
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| Nedelec, Florence; Statham, Peter J.; Sanders, Richard J.. |
| The aim of this project is to expand on our knowledge of the biogeochemical cycle of iron in different marine environments. Initially this has involved the development of a highly sensitive flow-injection analyser with chemiluminescence detection to measure picomolar concentrations of Fe in seawater. This work will focus on aspects of the inputs of iron, its redox speciation, the iron present in the colloidal fraction and the photoreduction processes in surface waters. |
| Tipo: Text |
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| Ano: 2003 |
URL: http://archimer.ifremer.fr/doc/00086/19751/17392.pdf |
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| Pollard, Raymond T.; Salter, Ian; Sanders, Richard J.; Lucas, Mike I.; Moore, C. Mark; Mills, Rachel A.; Statham, Peter J.; Allen, John T.; Baker, Alex R.; Bakker, Dorothee C. E.; Charette, Matthew A.; Fielding, Sophie; Fones, Gary R.; French, Megan; Hickman, Anna E.; Holland, Ross J.; Hughes, J. Alan; Jickells, Timothy D.; Lampitt, Richard S.; Morris, Paul J.; Nedelec, Florence; Nielsdottir, Maria; Planquette, Helene; Popova, Ekaterina E.; Poulton, Alex J.; Read, Jane F.; Seeyave, Sophie; Smith, Tania; Stinchcombe, Mark; Taylor, Sarah; Thomalla, Sandy; Venables, Hugh J.; Williamson, Robert; Zubkov, Mike V.. |
| The addition of iron to high- nutrient, low- chlorophyll regions induces phytoplankton blooms that take up carbon(1-3). Carbon export from the surface layer and, in particular, the ability of the ocean and sediments to sequester carbon for many years remains, however, poorly quantified(3). Here we report data from the CROZEX experiment(4) in the Southern Ocean, which was conducted to test the hypothesis that the observed north - south gradient in phytoplankton concentrations in the vicinity of the Crozet Islands is induced by natural iron fertilization that results in enhanced organic carbon flux to the deep ocean. We report annual particulate carbon fluxes out of the surface layer, at three kilometres below the ocean surface and to the ocean floor. We... |
| Tipo: Text |
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| Ano: 2009 |
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